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Abstract
The travel times of converted phases are used, together with crustal velocity models derived from a recent seismic refraction survey, to relocate approx 500 microearthquakes recorded by the Central Mississippi Valley regional seismic network. The relocated microearthquakes cluster tightly along previously identified epicentral trends. Focal depths range from 0.5 to 22 km, but events deeper than 14 km are rare, and events shallower than 3 km are confined, almost exclusively, to the area between Ridgely, Tennessee, and New Madrid, Missouri. Focal mechanisms are generally consistent with the result of previous studies. The axial seismicity trend, which extends from Caruthersville, Missouri, to Marked Tree, Arkansas, is characterized by right-lateral strike-slip motion on a NE trending, nearly vertical fault plane. The events between Ridgely, Tennessee, and New Madrid, Missouri, commonly show strike-slip focal mechanisms, with minor components of both normal and reverse dip slip.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The relocation of microearthquakes in the northern Mississippi embayment (USA) |
| Series title | Journal of Geophysical Research |
| Volume | 90 |
| Issue | B12 |
| Year Published | 1985 |
| Language | English |
| Publisher | Wiley |
| Contributing office(s) | Earthquake Science Center |
| Description | 14 p. |
| First page | 10223 |
| Last page | 10236 |
| Country | United States |
| Other Geospatial | Northern Mississippi embayment |
| Google Analytic Metrics | Metrics page |